Signaling apparatus foe telephone exchange systems



3 Sheets-Sheet 1.

(No Model.) I J. H. GARY.

SIGNALING APPARATUS FOR TELEPHONE EXCHANGE SYSTEMS.

' No. 285,342. Patented Sept. 18, 1883.

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J H. GARY. SIGNALING APPARATUS FOR TELEPHONE EXCHANGE SYSTEMS.

No. 285,342. Patented-Sept. 18, 1883.

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J. H. GARY. SIGNALING APPARATUS FOR TELEPHONE EXGHANGE SYSTEMS. No.285,342. Patented Sept. 18, 1883..

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I ton, in the county of Suffolk and State of Mastion withsignaling-instruments, and with a provided with a neutral armature isarranged UNITED STATES- PATENT OFFICE.

JAMES GARY, or BOSTON, MASSACHUSETTS, ASSIGNOR TO THE GARY TELEPHONESIGNAL COM PANY, OF SAME PLACE,

SIGNALING APPARATUS FOR TELEPHONE-EXCHANGE SYSTEMS.

SPECIFICATION forming part of Letters Patent No. 285,342, datedSeptember 18, 1883,

' Application filed May 14. 1883. (No model.)

To all whom it may concern:

Be it known that I, JAMES H. CARY, of Bossachusetts, have inventedcertain Improvements in Signaling Apparatus for Telephone- ExchangeSystems, of which the following is a specification.

My invention constitutes an improvement in telephone signaling;. and itsspecific object is to provide an apparatus for automatically actuatingand operating the signals of telephone-line circuits in cases where anumber of sub-stations are connected together in one circuit, and wherethe signaling apparatus of the said sub-stations are of the class knownas individual signals, wherein any one may be operated, andconsequentlyany station signaled, at the will of the central-officeoperator, to the exclusion of the others.

I have embodied this invention in an apparatus especially adapted foruse in connecsystem oi -signaling. invented by me and shown anddescribed in Letters Patent granted to me October 10, 1882, No. 265,753,and in an application for Letters Patent filed March 12, 1883.

In the patent which I'have cited I have described an individualsignaling apparatus in which at each sub-station an electro-magnet torotate a ratchet with a step-by-step movement by means of successiveelectrical pulsations of definite direction, which are transmitted overthe line from the central station. Each of these ratchets is combinedwith a circuit-breaking device, which, at a definite point or period inthe rotation of the ratchet differing for each station, is brought intoaction and actuated to introduce into the main-line troduced, may berung by rapidly-alternating currents transmitted from the centralstation.

In the application hereinbefore cited I have shown and described anamplification of and improvement on the said patent, which con sists incombining with a series of substations and signaling-instruments of thecharacter described therein a second series of signaling-instruments inwhich the call-bell electro-magnet is included in a local-batterycircuit normally open at two separate points, but

adapted to become operative only when the local circuit issimultaneously closed at the said two points. By this combination I amenabled to operate a much greater number of signaling-instruments uponone circuit than would otherwise be possible. In the operation of thesesignaling devices I have heretofore used a manual transmitting oractuating 6o apparatus consisting of suitable reversingkeys, combinedwith a magneto generator,

or with a voltaic battery and pole-changer, and adapted to transmit atwill constant electrical currents of either direction, orconstantly-alternating currents, according to the key pressed. It has,however, been ascertained,in the light of experience,that it is mostdesirable for the proper operation of such signals as I have describedthat the several elec- 7o trical impulses should be given with theutmost steadiness and uniformity. This requires close and unremittingattention and extreme care, accompanied with considerable delicacy ofmanipulation on the part of the operator; but by the use of my inventionthe manipulation of these signals is rendered a matter of extremelysimple and easy character, and the care and precision of the manualoperation are rendered unnecessary.

My invention for the regular uniform and automatic actuation of theforegoing system of individual signaling consists in certainarrangements and adaptations of apparatus and circuits by which eitherintermitting or constant currents of a uniform and given direction,constant, currents of the opposite direc tion, or currents of rapidalternating direction may be transmitted to the line, and, passing overthe same, operate the several bells there- 0 of each in its own time andin its own manner.

In the present embodiment of the invention I inclose in a suitable casea propelling mechanism of the type ordinarily used in districtvtelegraphs, which is operated by the running down of a spring wound upby the action of the operator immediately prior to setting the mechanismin operation-that is, the mechanism normally at rest is released fromits detent and wound up by one and the same instanta- IOO neousmovement, and by the act of runningv down expends its force, and oncemore comes to rest at its unison-point. Upon a rotating arbor actuatedby this mechanism are fixed tw rotary break-wheels and a circuit-closingtraveler. One ofthe break-wheels, arranged with equally-divided spacesof conducting and non-conducting material, subserves the purpose ofintermitting a constant current from a suitable source of electricity,and so producing a constant succession of momentary impulses andcessations of electricity, which act-uate the ratchets of the severalsignal-bells with the step-by-step motion required. The otherbreak-wheel is provided with two con tact -springs, arranged so thatwhen one of them is in contact with a conducting-space the other is incontact with a nonconducting space, and as one of these springs leadsfrom a source of electricity furnishing currents of constantdirection,and the other froma source furnishing constantly alternatingcurrents, this break -.wheel is adapted to determine which class ofcurrent may be sent to line. The circuit of the former spring isadjusted to close only at the same time that the circuit of the firstbreak-wheel closes on its conductingspaces, and thus as long as theapparatus is in notion the straight current only can pass to line. Thesecond spring only makes contact with its wheel when the circuit of theconstant generator is open at the first break-wheel; hence thealternating impulses which it governs can only pass to line when someother way is provided for them. This is effected by the travelingcircuit-closer hereinbefore referred to.

The instrument is provided with a number of spindles, each onerepresenting one of the bells in the circuit. These are arranged in twocircles. It will be understood that while all the bells in the circuitare brought to their ringing position by successive impulses ofelectricity, one series, when so brought into position, are adapted tobe rung by rapidalternations of current, while a second series areadapted to be rung by a protracted electrical impulse of even direction.One of the circular series of spindles are adapted to ring one of theseclasses, while the other series of spindles are assigned to the otherclass of bells. This arrangement, however, is arbitrary, and merelyadopted for convenience. \Vhen the mechanism is set in motion by thewinding of its spring, the traveling circuit-closer rotates. By alteringthe normal position of any of the spindles, the traveler will bearrested by the spindle altered, and the bell represented by thatspindle will thus be placed in position to ring, and will, moreover, berung andcontinue to ring until the spindleis restored to its originalposit-ion. The spindles may normally be all pushed in and adjusted toarrest the traveling arm when pulled out; or .they may normally bepulled out and adapted to become operative when pushed in; or, again, aportion of them may be normally pushed in and another portion pulledout, in either case being adapted to become operative by a changedposition. In this case I have shown the latter alternative. One seriesof spindles are adapted to make electrical contact with the travelingarm, and thus complete the circuit of the alternating generator,transferring the impulses thereof to line and ringing the bellcorresponding to the spindle manipulated. The other series of spindlesmerely make mechanical contact with the said arm, and their office is toarrest it in such a position that the springs of the first break-wheelare in contact with the conducting portions of the wheel, whereby thecurrent of the constant-direction generator is directed to the line foras long a period as the arm is arrested, ringing that bell of the secondseries which corresponds to the spindle moved. WVhen in either case thesignal has been given for a sufficiently-long period, it may be stoppedand the bells instantly brought to unison by the restoration of thespindle in use to its normal condition. To release all the bellssimultaneously from their unison-point, a key is provided which, whendepressed, is adapted to send a single pulsation of electricity to lineof a direction which, though constant, is opposite to that of thestepby-step currents used to actuate the several bell-ratehets. Thisactuates a polarized bararmature attached to all of the bells, as shownin the patent which I have hereinbefore cited, and releases the neutralarmatures, whereby the ratchets may be moved.

I will now enumerate and describe the several figures which illustrateand form a part of this specification.

Figure 1 is afront elevation of asignal-transmitting instrumentembodying my invention, a part of the front or dial being broken away toshow the operation. Fig. 2 is apartial sectional view of the travelingarm an d two of the governing-spindles, showing them in actual size.Fig. 3 represents a front view of the mechanism and of the severalcircuits, the front and sides of the casing being removed. Fig. 4 is aside elevation of the same, looking from the right, and Fig. 5 a sideelevation looking from the left, of Fig. 3. Fig. 6 is a detail showingthe starting and detaining devices, Fig. 7 is a detail of the propellingmechanism and escapement, and Fig. 8 a diagrammatical drawingrepresenting the course of the several circuits. Fig. 8 represents amodification of the arrangement shown in Fig. 8. Fig. 9 is a modifieddetail, showing the apparatus as arranged for a continuousthrough-cicruit.

Referring to the drawings, the entire apparatus, with the exception ofthe starting-button, the reversing-key, and the controllingspindles, iscontained in an inclosing-case, of which A is the front and B the backboard. Upon the top of the case is a strap-key, E, provided with a backcontact an d limit, f, and a front or anvil contact, 9. There is also astarting-spindle, D, provided with a fingerbutton, D, and normallyprojecting outward, as shown in Fig. 1, by the pressure of the spiralspring but capable of being pushed in, as shown by the dotted lines inthe same ure.

The heads of the governing-spindles a and is 1) project from the front,and these spindles are of the outercircle arepushed in.

. capable of being pushed inward or drawn outward, as in Fig. 2.Normally, in this embodi-.

inwardly as far as shown by the dotted lines,

illustrated by Figs. 3, 4, 5, 6, and 7.

and thus lie in the path of the arm 0, Fig. 2. Conversely, when any ofthe spindles a are pulled out, assuming the position shown in the dottedlines, the contact-pin d, attached thereto, is brought into the path ofthe arm 0. A stop-pin, 10, passes through the inner end, 10, of thespindles b and prevents them from being pulled out too far. In likemanner, at the point e a stop, (1, passes through the spindle a andserves the same purpose.

On the internal surface of the board A are a series of metalspring-plates, c", which are fastened to it, and which, with their freeends, press against the surface of the shank c of the outer circle ofspindlesa, as indicated in Fig. 1', where a portion of the board isbroken away to show the connections. All ofsaid plates are united withone another and with the other parts of the apparatus by wires 25 and21.

The wire 21, by suitable frictionsprings, connects with the main-linebinding-screw, and the wire 25 is of course normallyopen, except whenthe arm 0 in traveling comes in contact with any of the contact-pins dupon the spindles a.

InFi g. 1 the full circles represent the spin dleheads a, a, a a a a,and a and I), b, b b b bi, and b The small squares in dotted linesrepresent the holes in which the spindles slide,

and the springs 0 connected with the wire 25, are also shown in dottedlines in the outside circle.

The moving mechanism of the apparatus is It is affixed to the backboard. B, and consists of two brake-wheels, both carried, together witha revolving arm, on a single arbor. This is driven by an ordinarypropelling mechanism, of a character similar to that in ordinary use indistrict signaling-instruments, and well known to those skilled in theart of electric signaling. This propelling mechanism is placed in thebox G, and is composed of a spur-wheel,

L, Fig. 7, placed upon the upper arbor, a, and gearing into a pinion onthe lower arbor, 7c, which also, within the box G, carries anescapement-wheel, M. By the pallets O and weight N the speed may beregulated. Both of the arbors n and kproject outward from the box G, andcarry other operating devices. The spur-wheel L is normally inoperative,its motive power being a spring, I, which is not in tension, exceptduring the period of actual operation; but when the spindle D on the topof the box is depressed its inner end, D, presses upon the lever F,pushing it downward and .as it. is firmly fixed to the upper arbor, a,it gives that arbor a rotary moveallowing it to rise.

moving the pressure from the spindle D and The propelling spring willthen unwind, and in doing so will rotate the spur-wheel L in thedirection indicated by the upper arrow, 7, and the pinion, with thelower arbor,.will consequently participate in the motion, but in theopposite direction, and this motion, if unopposed, will continue untilthe arbor 26 has made a complete revolution, because the pin thas madetoo great an advance for the anchor-like detaining-lever to engage withit until it once more comes round to its normal place.

Fig. 6 shows the position assumed by the parts when the spindle D isdepressed, I) being the shank thereof, F the lever which it presses, mthe curved detaining-lever, and 2.

arbor by the bushing 3 The ofiice of the former break-wheel isto'alternately break and close the main circuit during the transmissionof straight currents to line, for the purpose of intermitting thosecurrents, and I may therefore designate this wheel as a rotarycircuitbreaker. The office of the other break-wheel, I, is to change thecircuit from the straighteurrent generator, and it may consequently beproperly termed a circuit-changer.

I will now describe the arrangement of the several contact-springs. Anon-conducting block, 12, carries a flat contact-spring, p, and this,with asecond con-V tact-spring, c, which is supported by a lowernon-conducting block, J, is adapted to make contact with the conductingprojections of the circuit-breaking wheel H, and they are so adjustedwith reference to one another as to make contact simultaneouslythat is,the spring 1) makes contact with one projection at the same instant thatthe spring 1) makes contact with another projection of the same wheel,so that the two springs are thus virtually connected with one anotherthrough the substance of the said wheel H. The non-conducting block Jsupports also five other contact-springs. These are, first, the spring0, which is adjusted to press outward and with its free endagainst acontact point or surface, an, upon the curved lever m. This contact,when the apparatus is at rest, forms the through-circuit from linepostto ground, and is broken by the first movement of the curved lever whenthe actuatingspindle D is depressed. Second, the springs q and T, which,though attached to different sides of the block J, areboth arranged tomake contact with the smaller break-wheel or circuitchanger, areadjusted to do so at different times, r being adjusted to be in contactwith the projections of the wheel I at the same time that the springs pand v are in contact with the other wheel, H, while, on the contrary, qis adjusted to make contact with the projections of thewheelI only whenthe circuit of the wheel H is open; third, the spring 8, which bearsupon the boss of the insulated traveling arm 0; fourth, the spring a,which bears upon the hub or boss of the break-wheel I.

Six binding-screw terminals are provided, as shown in Fig. 3 and in thediagram Fig. 8. Leading from these screws externally are the followingwires, partly indicated in Fig. 3, and fully in Fig. 8: from No. 1 aground wire, 22; from No. 6 a line-wire, 23, which in practice is noactual individual line, but a normally incomplete wire, adapted forconnection by a suitable switch with any required line; from Nos. 2 and3 the wires 17 and 1.8, leading to the positive and negative poles of anelectrical generator adapted to furnish constant currents of thedirection required. From Nos. 4 and 5 wires 19 and 20 lead to anelectrical generator adapted to evolve rapidly-alternating currents,such as a magneto-machine unprovided with a commutator.

Y is a base-board, upon which the respective generators are placed, Tbeing the straightcurrent generator, which may be of any suitablecharacter-for example, a magneto-machine provided with astraightening-commutator or a voltaic battery, and V being thealternating-current generator.

Internally the several wires connect the binding-screws with thecontact-springs and circuit breakers, closers, and changers in the f0l-'lowing manner:

From ground-post No. 1, for a purpose which will hereinafter appear, awire, 9, leads to a contact-spring, 9, under the strap-key E, and thereremains normally incomplete. From the same post a second wire, 26, leadsto the spring u, thus connecting the circuit-changing wheel Ipermanently with the ground. From binding-screw 2, which is connectedwith the plus pole of the straight-current generator, two wires leadinwardly-via, wire 7, leading to the anvil h of the strap-key, and wire10, which leads. to the contact-spring p of break-wheel I-I-thusbringing the positive pole of the said generator to the intermittentcircuit breaker. From binding-screw 3, representing the negative pole ofthe same generator, two wires also lead inwardly, wire 8 leading to theback contact, f, of the key E, and wire 11 leading to the spring 0,which is in normal contact with the curved lever m,- but one wire, 12,leads inward from terminal 4, which represents one of the alternatinggenerator-poles,

severally correspond with the several conditions of the apparatus. Whenat rest, the line-circuit through the instrument takes the wire 16 tothe fixed contact 1', against which the lever F presses when inert. Thiscontact, like the one immediately below, between m and o, is broken whenthe actuating-spindle is depressed. A wire, 15, connects the spring 1with the key E. \Vhile the instrument is moving and intermittentcurrents of constant direction are passing to line, or when thetraveling arm is arrested by the spindles b of the under circle, theline-wire enters the instrument by wire 13, which leads to spring 0 ofthe break-wheel H. When the traveling arm is arrested by the spindles ofthe outer circle, the line-wire takes the route by wire 21 to theseveral spindles a.

The pin 01, against which in the diagram the arm 0 is resting, is inpractice identical with the pin d of any of the spindles a, and is shownas in Fig. 8 merely to explain the connections.

I will now trace the several circuits and explain the operation thereof.

Let it be supposed that it is desired to produce a signal in a bell ofthe second class, in which, after the said bell is brought into ringingposition, the signal is given by a protracted impulse of electricity,which closes a local circuit in which the bell magnet is included. Thespindle of the inner circle, representing the bell which is to berung-for example, 12 is pushed in, and the spindle D 011 the top of theapparatus is depressed. The action, as hereinbefore described and asshown in Fig. 6, is to press the lever F down, simultaneously releasingthe pin 15 from the detaining-lever m and breaking the two contactsbetween i and F and between m and 0. The spindleD is at once released,flies back under the influence of the spiral spring 6, and thepropelling mechanism, wound up by the depression of the spindle, runsdown, rotating the circuit breaking and changing wheels H and I and thearm 0, until in due course the said arm strikes against the pushed-inspindle I). WVhile the motion is going on the action is as follows: Thetwo springs 19 and o alternately make and break contact with thewheelI-I, and during a portion of each make the spring 1' is also incontact with one of the narrower projections of the wheel I, the springq always coming into contact with the said projections when the formersprings, p and v, are not in contact with the wheel H. Each time thatthe circuit closes its course takes the following route: ground-wire 22,screw 1, wire 26, spring a, wheel I, spring 1', wire 15, key E, backcontact, f, wire 8, binding-screw 3, wire 13, gen-' erator T, wire 17,sending plus-current to line,

binding-screw'2, wire 10, spring 1), wheel H, spring 0, wire 13,binding-screw 6, and line, as before, by wire 23. Each time that theclosing of the two springs p and o is coincident with that of the spring1' a plus-current goes to line, to be intermitted, of course, by. thesucceeding break, and by this means the ratchets of all the bells in thecircuit are advanced step by step (one step for each electric pulsation)until the desired ringingpoint is reached. This occurs when the arm 0reaches the pushedin spindle; and all of the spindles b of the innercircle are so placed that when the arm is stopped by any of them thecircuit of the generator is completed, because the mechanism isarrested, leaving the springs 19 and o, and likewise the spring a", incontact with the projections of the two break-wheels. A steady currentis thus transmitted to line, attracting all the bell-armatures, andtherefore causing the bell that is brought to its ringing-point to givethe signal, which continues so long as the spindle remains pushed in.hen it has been given for. a suitable time, the spindle may bewithdrawn. The arm then passes round to its unisonpoint, where it isdetained by the engagement of the pin it with the curved lever on, andthe signal is discontinued.

To ring any one of the bells of the first class in which a normalshunt-circuit round a polarized bell is first to be broken, and thepolarizedtbell afterward rung by rapid alternation, the process issimilar. The spindle a of the outer circle, representing the desiredbella, for example-is pulled out, and the mechanism set in motion, asbefore. The intermittent pulsations of the generator T go to line, asbefore, bringing the bell into position by breaking the shunt-circuit atthe required point, this also, as before, occurring when the arm 0 isarrested by the pulled-out spindle a, the arm making contact with thepin d of the said spindle. This takes place at a moment when the springs19 and o and also the spring r are all out of contact with theprojections of the wheels H and I, but when the spring is in contactwith the wheel I. The alternating currents of the generator V now passto line over the following route: ground G, wire 22, binding-screw 1,wire 26, spring a, wheel I, spring q, wire 12, binding-screw 4, wire 19,generator V, wire .20, binding-screw 5, wire 14, spring 8, arm 0,spindle-pin d, wire 25, wire 21, binding-screw 6, and wire 23, to line.The alternating currents of the generator continueto pass to line and togive the signal on the distant bell as long as the spindle a remainswithdrawn, and are discontinued by pushing in the said spindle when thearm runs round to its detent and the bells to unison. At theunison-point all the bells show a dial, which indicates that the line isin use. When the communication is finished, the bells are released fromunison and made ready for another operation, and at the same time theline-in-use signal is withdrawn by a single and brief depression of thekey E. This reverses the current of the generator T, 'sendinga singlepulsation of negative sign to line over the following route: ground G,wire 22, screwpost 1, wire 9, spring key E, anvil h, wire 7, screw-post2, wire 17, generator T, wire 18, screw-post 3, wire 11, spring 0,contact-lever on, spring z, wire 16, screw-post 6, and wire 23,

to line. The single current thereby transmitted reverses the polarity ofthe bell-magnets, and these, acting upon a polarized armature and lever,operateto withdraw the line-inuse signal.

I may, without departing from the spirit of my invention, use but onegenerator, T, as shown in Fig. 8, and four wires therefor, two of whichconnect through a commutator, 0 for the transmission of straight oruniform direction currents, while the remaining two are connected withthe opposite ends of the arbor of the generator-armature, and areunconnected with the commutator, and are hence adapted to furnishalternating currents.

I am aware that other automatic devices have been heretofore used forindividual electric signaling, but, so far as I know, they have beenexclusively arranged and adapted to send successive currents of a givenpolarity or direction while running and a steady or continuous currentof opposite direction when stopped at any bell. My apparatus is adapted,however, in addition to the transmission of successive impulses ofdefinite polarity, bringing the several bells of two classessuccessively to their ringing position, to send to line after thatposition is attained either a steady current of the same direction asthat used to advance the bells or a rapid series of alternating currentsadapted for ringing of polarized bells, the character of ringing-currentbeing determined by the arresting-spindle used; and by this arrangementtwice the number over, although I have described a propelling apparatusconsisting of a spring motor adapted to be wound up by the act ofsetting the machine in motion, such as used in districttelegraph boxes,I may, without prejudice to this invention, employ any mechanicalequivalent therefor, such as a direct-acting weight, or a clock-trainimpelled either by weight or spring. V

Inasmuch as it is evident that the instru ment which constitutes thesubject of my invention is to be used only whilesignaling is actuallygoing on, I have not herein shown or described so far an arrangementadapted to constitute-a through short circuit. It is, however, equallyevident that such a short circuit is, in the nature of the foregoingarrangement,

, of bells may be utilized on one circuit. Morealready constituted, withthe exception of a I hiatus between the small circuit-changing wheel Iand the spring T, which normally is .not in contact therewith. If forany reason it becomes desirable to provide a short through circuitcutting out the mechanism, this may be shown in Fig. 9.

readily done by modifying the construction, as In that arrangement thespring 1' is fixedupon a non-conducting block, 2'0, above instead of 011one side of the wheel I, and is normally pressed against the peripheryof the said wheel between its conducting projections by means of theheel X of the lever F, which heel is made of non-conducting material forthat purpose.

I claim- 1. An automatic apparatus-for transmitting individual electricsignals, consisting, sub stantially as hereinbefore described, of animpelling mechanism, an arbor or shaft capable of rotation and impelledthereby, a rotary circuit-changer in the main circuit between the groundand line wires, fixed upon the said shaft, but insulated therefrom, andadapted to alternately direct straight or alternating impulses to line,a rotary circuit-breaker, also fixed upon the same arbor andelectrically connected therewith and included in circuit between thecircuit-changer and the line-wire, whereby the straight current fromsaid circuit-changer, when being transmitted to line, is broken up intosuccessive impulses, a rotary arm, also carried upon the said arbor, butinsulated therefrom and connected with a generator ofrapidly-alternating impulses, and two series of arresting-spindles, eachof the said spindles representing an individual signaling-instrument,and each adapted to arrest the motion of the traveling arm, the spindlesof the first series being adjusted to arrest the arm when thecircuitcloser and circuitchanger are in position to send a steady andconstant current to line, and the spindles of the second series beingprovided with contact-springs and adjusted to arrest the traveling armand make electrical contact therewith when the circuitchanger is inposition to transmit alternating currents to line, for the purposesspecified.

2. The combination, substantially as hereinbefore described, of means,as indicated, for producing and automatically transmitting successivelyelectrical impulses of definite direction, devices whereby the number ofsuch impulses may be automatically counted and de termined, and whereby,after the desired number are transmitted, the said successive impulsescease and a steady current of similar direction substituted therefor,and other devices whereby, after the desired number of successiveimpulses are transmitted, their transmission is arrested and a series ofrapidly-alternating currents substituted therefor and transmitted toline, for the purposes de scribed.

3. The combination, substantially as described, of means, as indicated,for producing electrical currents of definite direction, means forinterrupting the said currents and automatically transmitting thesuccessive impulses so produced, devices whereby, after a desired numberof the said impulses have been so transmitted, the transmission iscaused to cease and an uninterrupted current substituted therefor, otherautomatic devices adapted, after the transmission of a desired number ofsuccessive impulses of a given direction, to

stop the said transmission and substitute there r for a series ofrapidly-alternating currents, and other means adapted for manualoperation, whereby a single pulsation of direction constant but oppositeto that of the successive impulses may be transmitted to line, "for thepurposes specified.

4. The combination, in an automatic appa ratus for transmittingindividual signals, of an impelling mechanism normally at rest, a normalshort circuit through the apparatus, a starting-spindle for theimpelling mechanism, adapted by its first movementto break the saidshort circuit, a rotary circuit-closing wheel, normally short-circuited,but adapted to be introduced into the circuit when the instrument is inoperation, and to transmit to line successive electrical impulses ofdefinite direction, and a key normally maintaining through its back,contact the said direction, but adapted, when depressed, to send animpulse of opposite direction, for the purposes described. 7

5. The combination, substantially as hereinbefore described, of agenerator adapted to evolve currents of constant direction, a rotatin gcircuit-breakin g wheel therefor,to produce intermissions in the saidcurrents and cause the transmission of successive impulses to line, anelectrical generator adapted to produce alternating currents, a rotatorycircuit-changer fixed upon an arbor with the said circuit-breakingwheel, but insulated therefrom, and by suitable contact-springs adaptedto make contact successively and intermittently with the sev eralgenerators, the spring being so adapted that the contact with theconstant-current generator is made cotemporaneously with the closing ofthe circuit thereof at the circuitwheel, and the contact with thealternating generator being made when the circuit of theconstant-current generator is open at that point, a rotating armpermanently in circuit with the alternating-current generator, fixedupon and rotating with the arbor of the said circuit breaker andchanger, but insulated therefrom, and a series of stop-spindles capableof being placed in the path of the said arm to arrest the mechanismafter a certain number of impulses have been transmitted, the saidnumber corresponding to that of the spindle actuated, and to completethe circuit of the alternating generator, whereby rapidly-alternatingimpulses may be transmitted to line for the purpose of ringing thepolarized bell represented by the spindle effectuating the mech- *anismafter a definite number of impulses, differing for each, have been sentto line, at a time when the circuit of the straight-current generator iscompleted to line, whereby a steady current of definite direction may betransmitted to line for the purpose of ringing the neutral bells, as andfor the purposes specified.

IIO

IIS

6. The combination, in an automatic signaling transmittinginstrument, ofan impelling mechanism, an; electrical generator adapted to evolveconstant currents, a second electrical generator adapted to emitalternating currents, a circuit-controlling wheel adapted to intermitthe constant currents, a circuit changing wheel located in the maincircuit, and by means of suitable contactsprings adapted to close thecircuit of the constant generator through the circuit-controlling wheelto line, or to close the circuit of the alternatingcurrent generator,atraveling circuit-closing arm, and stopstherefor, each stop beingadapted to arrest the said arm and the entire mechanism at a differentperiod, the stops of one series being adjusted to stop the said arm whenthe circuit of. the constant-current generator is completed through thecircuitchanger to line, and the stops of the other series being adjustedto stop the said arm and complete the'circuit of the alternating-currentgenerator to line, when the same circuit is also closed through thecircuit-changer, for the purpose 7. The combination, in an automaticappa thereon, but insulated therefrom, the traveling arm 0, also carriedby the said arbor and and adapted as hereinbefore specified, where bysuccessive electrical impulses of given direction may be sent to line toadvance the ratchets of the several signal-bells, whereby when any ofthe spindles b is caused to arrest the progress of thetraveling arm aconstant current of the same direction is sent to line, and when any ofthe spindles a stops the progress of the said arm alternating currentsare sentto line, and whereby when the said key E is depressed a constantcurrent of opposite direction to that of the successive impulses is sentto line, substantially as described,

In testimony whereof l have signed my name to this specification,in thepresence of two subscribing witnesses, this 10th day of May, 1883.

JAMES H. GARY.

Vitnesses 0. F. BROWN, A. L. Wnrrn.

